Dieter: I have reviewed this "trick play" with Lizzie (Leela Zero and Katago). Both engines prefer this variation over the "correct" variation.

White cuts and is tricked

After this sequence, may players will feel satisfied that they have captured the marked stone . In reality, they have been tricked.

Tricked, simple continuation

One way for black to continue is to play like this. White gets only 4 or 5 points in the corner, while her marked stones () are cut off. Black is strong on both sides, so this result is terrible for white.

Dieter: AI prefer this variation, getting the corner in sente and the aji of the marked stones.

Tricked and a further trick

Black can also continue with . This sets up another trick because the corner is not 100% alive yet. If, for example, white considers the corner alive and plays through . Black can kill the corner.

Herman: @Dieter, how does AI feel about this? Extending is, IMO, the main line for black. The atari in the previous diagram feels like a thank you move.

Considering the above, white should play 1 to defend the corner. Now the p-q-r threat is gone, because the white capture at s then creates 2 liberties (r, t) instead of damezumari.

Herman: @Dieter: Specifically, this is considered the "correct" continuation after extending and now black gets sente (or he can use it to spend a move to encircle white's central stones)
The classification of above as "trick" or "obvious threat" is in the eye of the beholder.

White atari

White atari at 7.

The white atari at 7 is a mistake. Black captures with .

White atari, continuation

After black captures the stone at 3-3, white can only give atari with . After black defends, white has two cutting points. White will defend the upper cutting point at , after which black cuts with . With and , white sacrifices another stone and sets up a ladder. If the ladder is bad for white, this is a disaster, but even if it is good, black is very happy. Black gets a big corner in sente and can look forward to play a ladder breaker later on.